attemtp to fix test

tests/lib/Files/Storage/Wrapper/EncryptionTest.php

@@ -566,6 +566,12 @@ class EncryptionTest extends Storage {
 	 * @param string $strippedPath
 	 */
 	public function testGetHeader($path, $strippedPathExists, $strippedPath) {
+		$cache = $this->getMockBuilder('\OC\Files\Cache\Cache')
+			->disableOriginalConstructor()->getMock();
+		$cache->expects($this->any())
+			->method('get')
+			->willReturn(['encrypted' => true]);
+		
 		$sourceStorage = $this->getMockBuilder('\OC\Files\Storage\Storage')
 			->disableOriginalConstructor()->getMock();
 
@@ -597,7 +603,7 @@ class EncryptionTest extends Storage {
 					$this->encryptionManager, $util, $this->logger, $this->file, null, $this->keyStore, $this->update, $this->mountManager, $this->arrayCache
 				]
 			)
-			->setMethods(['readFirstBlock', 'parseRawHeader'])
+			->setMethods(['getCache','readFirstBlock', 'parseRawHeader'])
 			->getMock();
 
 		$instance->expects($this->once())->method(('parseRawHeader'))